Which groups of organisms are the most successful air breathing land invertebrates?

a. Frogs
b. Snails
c. Lobsters
d. Spiders
e. Birds


d

Biology & Microbiology

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Which of the following best describes cyanobacteria?

A. They all can use H2S as a source of electrons for photosynthesis. B. Their photosynthetic pigments are carried in chlorosomes. C. They carry out anoxygenic photosynthesis. D. They carry out oxygenic photosynthesis.

Biology & Microbiology

An enzyme substrate complex is represented by

a. C. b. D. c. E. d. D and E. e. None of these.

Biology & Microbiology

Choose the true statements about the evolution of larval dispersal in marine snails.

A. Cladistics shows that there are more instances of the transition from dispersing to non-dispersing larvae than the reverse. B. Loss of structures in the transition from dispersing to non-dispersing may inhibit evolutionary reversal. C. Possession of dispersing larvae is the ancestral state in snails. D. The evolution of non-dispersing snails is likely to hinder speciation. E. Clades of non-dispersing snails are less species rich than those of dispersing snails.

Biology & Microbiology

In the synthesis of amino acids, the addition of the amino nitrogen usually occurs ________ the synthesis of the carbon skeletons.

A. after B. during C. before

Biology & Microbiology